Botnets are made up of ordinary computers that have been infected with malware. The owners of these computers might notice unusual slowness or odd behavior, but many don't realize they're infected at all.
When the creator of the botnet sends out an order, all the infected computers act on it. These commands can be anything from sending spam email to generating large amounts of random traffic. Having thousands of computers simultaneously visit a site can cripple it, in what is known as a "DDoS" (Distributed Denial of Service) attack.
Of all the ways to design a keyboard, how did we end up with QWERTY?
Back in the late 1800’s, typewriters had a more conventional “ABCDE” layout of keys. The problem? Pressing two neighboring keys could cause the keys to clash and jam together, ruining the typed paper. This was especially common with certain letter combinations like “st.”